1phần2+1phần6+1phần12+1phần2
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A = 19\(\dfrac{1}{4}\) + \(\dfrac{1}{2\dfrac{1}{3}}\) + 5,75 - \(\dfrac{1}{6}\) + 74
A = \(\dfrac{77}{4}\) + \(\dfrac{1}{\dfrac{7}{3}}\) + 5,75 - \(\dfrac{1}{6}\) + 74
A = \(\dfrac{77}{4}\) + \(\dfrac{3}{7}\) + \(\dfrac{23}{4}\) - \(\dfrac{1}{6}\) + 74
A = \(\dfrac{3234}{168}\) + \(\dfrac{72}{168}\) + \(\dfrac{966}{168}\) - \(\dfrac{28}{168}\) + \(\dfrac{12432}{168}\)
A = \(\dfrac{16676}{168}\)
A = \(\dfrac{4169}{42}\)
\(\left(3\frac{1}{2}+5\frac{2}{3}\right)\times\frac{8}{19}-\left(2\frac{1}{2}+4\frac{2}{3}\right)\times\frac{8}{19}\)
\(=\frac{8}{19}\times\left[\left(3\frac{1}{2}+5\frac{2}{3}\right)-\left(2\frac{1}{2}+4\frac{2}{3}\right)\right]\)
\(=\frac{8}{19}\times\left(3\frac{1}{2}+5\frac{2}{3}-2\frac{1}{2}-4\frac{2}{3}\right)\)
\(=\frac{8}{19}\times\left[\left(3\frac{1}{2}-2\frac{1}{2}\right)+\left(5\frac{2}{3}-4\frac{2}{3}\right)\right]\)
\(=\frac{8}{19}\times\left(1+1\right)\)
\(=\frac{8}{19}\times2=\frac{16}{19}\)
1/2 + 1/4 +1/8 + 1/16 + 1/32 +1/64 + 1/128
=127/128
dấu gạch chéo này là dấu gạch ngang của phân số
\(\dfrac{1}{2}\)+ \(\dfrac{1}{6}\)+ \(\dfrac{1}{12}\)+ \(\dfrac{1}{2}\)
= \(\dfrac{6}{12}\)+ \(\dfrac{2}{12}\)+ \(\dfrac{1}{12}\)+ \(\dfrac{6}{12}\)
= \(\dfrac{15}{12}\)
= \(\dfrac{5}{4}\)
1phần20nha